Here is how to enter a new contact with a "hard pause". I believe for an existing number you can go into the number and follow the same steps.
1. In standby mode, enter the phone
number you wish to save.
2. Select Save.
3. Enter the name, and select OK >
Done.
When you enter a number, you can
select Options > Insert pause (’p’) to
insert a pause code or Options > Insert
wait (’w’) to insert a wait code.
Does that help any?